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n in (-oo:+oo)
3-(5*n) = 17-3*n // - 17-3*n
3-(5*n)-(-3*n)-17 = 0
3*n-5*n-17+3 = 0
-2*n-14 = 0 // + 14
-2*n = 14 // : -2
n = 14/(-2)
n = -7
n = -7
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